Phân loại kết cấu khuôn
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Transcript of Phân loại kết cấu khuôn
Phn loi kt cu khun Cc loi kt cu khun ph thuc nhiu vo loi vt liu phun, bi v mi sn phm c thit k khc nhau, khi thit k khun chng ta phi hiu nhng yu t nh hng nh hnh hc, s lng khun, nguyn l y, vt liu nha v hnh dng ca sn phm. Phn loi c bn ca khun ph thuc vo kt cu c ch ra cc hnh bn di: 1. Khun tiu chun (Standard Molds) Khun tiu chun l khun c thit k n gin nht, c bn khun tiu chun c kt cu ging vi khun hai tm, chng c chia thnh 2 bn: Phn lng khun v phn li, phn lng khun l phn vt liu t u phun p vo lng khun to hnh, chng gm c cung phun knh dn. Phn li to hnh dng cho li, h thng tch sn phm v h thng y, phn ny c thit k h thng y.
Khun tiu chun c mt ng phn khun, v c mt hng m khun. Loi khun ny c th dng cho tt c loi nha v khng c undercut bn trong v bn ngoi. 2. Khun c li mt bn (Slide mold) Khun ny c dng cho nhiu loi khun vi s tch hp thm phn trt, khun li mt bn c bn i chuyn ng ngang thnh chuyn ng dc, loi khun ny c dng sn xut cc sn phm c undercut.
3. Khun 3 tm (Three plate molds) Khun ba tm thng c hai ng phn khun v c tm git ui keo c gi bi cc cht , v khun c hai ng phn khun, h thng knh dn c th b tr mt bn ca tm git ui keo hoc ch to mt tm c bit c th gn vo tm git ui keo, gi l tm knh dn. Khun ba tm c dng do kh nng b tr ming phun linh hot ca n. Loi khun ny cng c dng nhiu trong khun nhiu lng khun.
4. Lng khun ghp (Split Cavity Mold) V c bn th khun ghp cng ging nh khun hai tm tiu chun nhng chng c mt khi ghp to undercut cho sn phm hoc cc ren ngoi.
loi khun ny c dng khi cc li mt bn khng to undercut hoc ren. Bt li ca khun ny l khi s dng cho cc sn phm nh, th vic b tr kh khn. 5. Khun vi vt tho ( to ren) (Mold With Screw Device) Khun ny chuyn dng to ren, li c th quay trong qu trnh tch khun, c ren trong v ren ngoi c th hnh thnh thng qua loi khun ny.
T hnh minh ha ta c th thy chng c thit b truyn bng bnh rng, bnh rng s quay khi to hnh ren. 6. Khun vi vng y (Stripper Ejector Mold) Loi ny chuyn dng to cc sn phm hnh tch m khng c unddercut, vng y s gip vic y mt cch d dng v nng lng y tp trung vo ton b sn phm v khng to ra nhiu vt trn sn phm.
Cc loi khun phc tp v kh hn cng c to thnh bng cch tch hp v kt hp gia cc loi khun ny.
